| Arakona Limited | Administrative & support | 2009 |
| Aral Cleaning Solutions Ltd | Administrative & support | 2026 |
| Aram Traders Ltd | Wholesale & retail | 2026 |
| Aramais Consulting Ltd | Information & communication | 2026 |
| Aramy Ltd | Hospitality | 2015 |
| Arapaho Subs LLP | | 2005 |
| Ararna Limited | Professional & scientific | 1999 |
| Aras Logistics Limited | Transport & logistics | 2025 |
| Aravind Lochan Nallan Chakaravarthi Venkata Varada Ltd | Information & communication | 2025 |
| Arba Store Ltd | Manufacturing | 2025 |
| Arbrexus Limited | Education | 2018 |
| Arbs Enterprises Ltd | Wholesale & retail | 2025 |
| Arbury Delights Ltd | Financial services | 2022 |
| Arbury Garth Management Company Limited | Real estate | 2000 |
| ARC Consultancy Limited | Professional & scientific | 2019 |
| ARC Properties Alcester Limited | Construction | 2022 |
| Arcasaporis Cakes and Bakes Limited | Manufacturing | 2026 |
| Arch Global Properties Limited | Real estate | 2020 |
| Arch Global UK Limited | Wholesale & retail | 2016 |
| Arch Market Limited | Professional & scientific | 2020 |
| Archade Fusion Limited | Information & communication | 2024 |
| Archen Training & Consultancy Ltd | Education | 2019 |
| Archer Bassett (Sales) Ltd | Real estate | 2017 |
| Archery Fields Property Owners Management Company Limited | Real estate | 2005 |
| Arches Flooring and Beds Ltd | Wholesale & retail | 2018 |
| Archie DYE Trading Ltd | Wholesale & retail | 2026 |
| Archie's Property Services Ltd | Households | 2025 |
| Archilab Design Ltd | Professional & scientific | 2021 |
| Archisource Limited | Information & communication | 2020 |
| Architecture & Engineering Services Limited | Professional & scientific | 2017 |
| Architecture IT Services Limited | Information & communication | 2011 |
| Archytekton Ltd | Professional & scientific | 2023 |
| Arcklen Group Ltd | Professional & scientific | 2025 |
| Arcnative Ltd | Manufacturing | 2023 |
| Arcturus Labs Ltd | Information & communication | 2026 |
| Arcvolt Ltd | Professional & scientific | 2025 |
| Arda Fish Ltd | Hospitality | 2019 |
| Arda Interiors Ltd | Professional & scientific | 2026 |
| Arden & Halle Personnel Contracts Limited | Administrative & support | 2024 |
| Arden Active CIC | Arts & recreation | 2022 |
| Arden Auto Trading Ltd | Wholesale & retail | 2025 |
| Arden Clean Limited | Administrative & support | 2025 |
| Arden Cross Limited | Construction | 2016 |
| Arden Edge Limited | Real estate | 1964 |
| Arden Fine Foods (UK) Limited | Wholesale & retail | 1991 |
| Arden Fire Health and Safety Limited | Professional & scientific | 2017 |
| Arden Firewood Ltd | Wholesale & retail | 2025 |
| Arden Group Holdings Limited | Other services | 1994 |
| Arden Group Limited | Construction | 2003 |
| Arden Grove Properties Limited | Households | 1981 |
| Arden Hayes Homes Ltd | Construction | 2023 |
| Arden Midlands Group Ltd | Transport & logistics | 2019 |
| Arden Midlands Limited | Mining & quarrying | 2011 |
| Arden Numismatics Ltd | Administrative & support | 2018 |
| Arden Products Ltd | Wholesale & retail | 2024 |
| Arden Psychology Services Ltd | Health & social care | 2011 |
| Arden Tax & Accountancy Limited | Professional & scientific | 2010 |
| Arden Topco Limited | Professional & scientific | 2015 |
| Arden University Limited | Education | 1989 |
| Arden Windows Limited | Manufacturing | 1989 |
| Ardent PPE Limited | Manufacturing | 2025 |
| Ardent Property Services Limited | Construction | 2019 |
| Ardun Homes Limited | Real estate | 2016 |
| Area International Furniture Limited | Wholesale & retail | 2023 |
| Areenix Ltd | Wholesale & retail | 2025 |
| Areerat Services Ltd | Transport & logistics | 2009 |
| Arelpe Ltd | Professional & scientific | 2019 |
| Aremeadow Limited | Wholesale & retail | 2024 |
| Arena Auto Centre Ltd | Wholesale & retail | 2017 |
| Arena Kebab Limited | Hospitality | 2025 |
| Arena Motor Repairs Limited | Wholesale & retail | 2009 |
| Arena Subs Limited | Hospitality | 2024 |
| Arena Transfers Ltd | Manufacturing | 2010 |
| Arendi Ltd | Transport & logistics | 2016 |
| Aretas Records Ltd. | Information & communication | 2014 |
| Arezzo Architecture Limited | Professional & scientific | 2020 |
| Arfan Cooperation Limited | Other services | 2024 |
| Arfi Limited | Other services | 2005 |
| ARG Prop Management Services Limited | Real estate | 2026 |
| Argand 400 Limited | Other services | 2020 |
| Argand 600 Limited | Other services | 2020 |
| Argentium Global Sales Limited | Wholesale & retail | 2020 |
| Argentium International Limited | Professional & scientific | 2006 |
| Argentium Sales Limited | Wholesale & retail | 2020 |
| Argus International Limited | Wholesale & retail | 1993 |
| Argyle (UK) Limited | Administrative & support | 2006 |
| Argyle Real Estate Ltd | Real estate | 2022 |
| Aria World Market Ltd | Wholesale & retail | 2023 |
| Ariash Trading Limited | Wholesale & retail | 2025 |
| Aric Driver Training Ltd | Transport & logistics | 2017 |
| Ariela Home Care Ltd | Health & social care | 2022 |
| Aries Agro International Ltd. | Wholesale & retail | 2015 |
| Ariha Traders Ltd | Real estate | 2026 |
| Ariseandsoar Limited | Extraterritorial | 2021 |
| Arising Care Limited | Health & social care | 2024 |
| Arising Youth CIC | Education | 2023 |
| Arista Laboratories Europe Limited | Professional & scientific | 2002 |
| Aristica Lungu Ltd | Transport & logistics | 2020 |
| Aristide Leib Limited | Wholesale & retail | 2017 |
| Ariton Trans Ltd | Transport & logistics | 2015 |